package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

	//因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
	//不能实现数据库操作
	public EduSubjectService subjectService;
	public SubjectExcelListener() {}
	public SubjectExcelListener(EduSubjectService subjectService) {
		this.subjectService = subjectService;
	}

	//读取excel内容，一行一行进行读取
	@Override
	public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
		if(subjectData == null) {
			throw new GuliException(20001,"文件数据为空");
		}

		//一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
		//判断一级分类是否重复
		EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
		if(existOneSubject == null) { //没有相同一级分类，进行添加
			existOneSubject = new EduSubject();
			existOneSubject.setParentId("0");
			existOneSubject.setTitle(subjectData.getOneSubjectName());//一级分类名称
			subjectService.save(existOneSubject);
		}

		//获取一级分类id值
		String pid = existOneSubject.getId();

		//添加二级分类
		//判断二级分类是否重复
		EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
		if(existTwoSubject == null) {
			existTwoSubject = new EduSubject();
			existTwoSubject.setParentId(pid);
			existTwoSubject.setTitle(subjectData.getTwoSubjectName());//二级分类名称
			subjectService.save(existTwoSubject);
		}
	}

	//判断一级分类不能重复添加
	private EduSubject existOneSubject(EduSubjectService subjectService, String name) {
		QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
		wrapper.eq("title",name);
		wrapper.eq("parent_id","0");
		EduSubject oneSubject = subjectService.getOne(wrapper);
		return oneSubject;
	}

	//判断二级分类不能重复添加
	private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid) {
		QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
		wrapper.eq("title",name);
		wrapper.eq("parent_id",pid);
		EduSubject twoSubject = subjectService.getOne(wrapper);
		return twoSubject;
	}

	@Override
	public void doAfterAllAnalysed(AnalysisContext analysisContext) {

	}
}